Study of laser cladded Co-based alloy/SiCp coatings on IF steel

Coatings,made of Co-Cr-W-Ni-Sialloy+20% SiCp,deposited by laser cladding on IF steel are introduced. Cross section of such coatings has been examined to reveal their microstructure using optical moic-roscope,scanning electron and XRD. There existed some crystallization morphologies in different regions,such as planar,cellar (at the bonding area),columnar and dendrite (at the center and near the surface). XRD showed that the primary phase γ-Co dendrite and Si2W,CoWSi,Cr3Si,CoSi2 existed in the coatings. The results also showed that the wear resistance of the clad layer improved by adding SiCp.